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                  <p><small><a
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is a free cross-platform archiver and backup utility that provides an
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portable GUI for many Open Source technologies like 7-Zip, FreeArc,
PAQ, UPX... free alternative to WinRar, WinZip </small><small>and
similar
proprietary software</small><small>.<br>
- Create 7Z, ARC, BZ2, GZ, *PAQ, PEA, QUAD/BALZ, TAR, UPX, WIM, XZ, ZIP
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RAR, UDF, ZIPX files and more,</small><small> over 200 archive types
supported</small><small><br>
Features of PeaZip includes: </small><small> </small><small>archives
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archives at once, </small><small>convert files, </small><small>create
self-extracting archives, split &amp; join files,
strong encryption with two factor authentication, encrypted password
manager, </small><small>secure deletion, </small><small>find
duplicate files, </small><small>calculate hash / checksum,
export job definition as script to automate backup / restore tasks.</small></p>
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            <td colspan="1" rowspan="1" style="vertical-align: top;"> <br>
            <h1 style="text-align: center;"><big><big><big><a
 name="optimize_wmware_virtualbox"></a>Optimize Virtual Machines and
disk images size<br>
            </big></big></big></h1>
            <br>
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                  <ul>
                    <li>
                      <p><a
 href="optimize-virtual-machines-backup-images.html#how_to_decrease_vm_size">OPTIMIZE,
REDUCE
DISK OCCUPATION OF VIRTUAL MACHINES</a></p>
                    </li>
                  </ul>
                  <p> </p>
                  </td>
                  <td style="vertical-align: top; width: 128px;">
                  <h2><img
 title="Reduce size of Virtual Machines and disk images"
 alt="reduce space occupation of virtual machines"
 src="file-format/tips-tricks.png" style="width: 96px; height: 96px;"
 align="right"></h2>
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 style="background-color: rgb(255, 255, 255); vertical-align: top;">
            <div style="text-align: left; color: rgb(0, 0, 0);">
            <h2><big><big><big><a name="how_to_decrease_vm_size"></a><a
 href="optimize-virtual-machines-backup-images.html#optimize_wmware_virtualbox">Optimize,
reduce
disk occupation of
Virtual Machines</a></big></big><br>
            </big></h2>
            </div>
            <br>
            <br>
            <h3><big style="font-weight: bold;">Zeroing files and free
disk space</big><span style="font-weight: bold;"><br>
            </span></h3>
            <br>
            <a name="prepare_virtual_machine_for_compression"></a>"<span
 style="font-weight: bold;">Zero delete</span>" function in
PeaZip's "File tools" submenu is intended for overwriting data with
all-0 stream, either as a file deletion option or as a supported mode
for overwriting partition's free space, in order to fill corresponding
physical disk area of homegeneus, highly compressible data.<br>
Marginally, this deletion and free space optimization mode also offers
an improved basic grade of security over PeaZip's "Quick delete"
function, which
simply remove the file from filesystem, making it not recoverable by
system's recycle bin but susceptible of being recovered with undelete
file utilities.<br>
Zero deletion however is not meant for advanced security, and PeaZip's <span
 style="text-decoration: underline;"></span><a href="secure-delete.html">secure
delete function</a> should be used instead
when it is needed to securely and permanently erase a file or sanitize
free space on a volume.<br>
            <h2><img title="Overwrite free disk space"
 alt="reduce disk occupation of virtual machines"
 src="secure-delete.png" style="width: 146px; height: 45px;"></h2>
            <br>
            <br>
            <h3><big><span style="font-weight: bold;">Optimize virtual
disk
images size using zero delete</span><br>
            </big></h3>
            <br>
            <a name="optimize_virtual_disk_size"></a>A <span
 style="font-weight: bold;">Disk image</span> is a snapshot of
the content of a disk, meaning all the content of the disk is mirrored
into a file which is a 1:1 copy of the source.<br>
This involves saving exactly the data is stored on the unit, bypassing
possible filesystem's problems or limitations, and avoiding the
inherent overhead in managing data as separate files running a set of
high level software to read the filesystem structure, which means data
recovery software may be simpler and faster, improving performances and
reducing possible issues by design.<br>
This is usually an higly efficient way to backup large quantities of
data, and to perform a full system backup which in disaster recovery
events can be deployed without, unlike plain data backup, needing
additional work to restore the system, software, licenses etc.<br>
But, being created in a filesystem-agnostic way, the image of the disk
contains all data featured on the unit, including ones in sectors
marked (in the filesystem) as deleted data, which may represent a
sizeable overhead - especially over the time, as files gets created and
deleted on the physical machine.<br>
Zeroing the free space (and zeroing files being deleted) let the free
space in an higly ordered, highly compressible state, that brings
substantial improvement in terms of size reduction of resulting disk
images even with most elementary compression algorithms - often
built-in in disk imaging systems.<br>
Consequently, it is recommended to perform PeaZip's "Zero delete free
space" on physical machines before saving disk images for
backup/disaster recovery purpose (or to routinely delete files with
Zero delete function) to substantially reduce the size of the disk
image: when the disk image gets compressed (either for built-in
space occupation -optimization mechanisms, or for backup purpose) the
space occupied on the media will be greatly reduced due better
compression ratio being achiveable, and overall speed of the operating
will be greatly improved - needing to handle a substantially smaller
amount of data.<br>
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 style="vertical-align: top; text-align: right; width: 128px;">
                  <h2><span style="font-weight: bold;"><img
 title="Manage VMDK, QCOW2, VDI, VHD virtual disks"
 alt="how to reduce size of virtual machines"
 src="file-format/quotes.png" style="width: 32px; height: 32px;"></span></h2>
                  </td>
                  <td style="vertical-align: top; font-style: italic;"><big>PeaZip
supports reading (browse, search, extract) various types of disk images
commonly used by virtualization software: <span
 style="font-weight: bold;">QCOW2</span> (QUEMU), <span
 style="font-weight: bold;">VMDK</span> (VMWare
Virtual Machine Disk), Microsoft <span style="font-weight: bold;">VHD</span>
(Virtual PC, Azure),
and <span style="font-weight: bold;">VDI</span> (Oracle VirtualBox
Virtual Drive Image), can <a href="iso-utility.html">read iso files</a>,
and <a href="wim-files.html">read and write wim files</a><br>
                  </big></td>
                  <td style="vertical-align: bottom; width: 128px;">
                  <h3><img
 title="Optimize quemu, vmware, virtualbox disks"
 alt="how to reduce disk occupation of virtual machines"
 src="file-format/quotes-inverse.png" style="width: 32px; height: 32px;"></h3>
                  </td>
                </tr>
              </tbody>
            </table>
            <br>
            <h3><big><span style="font-weight: bold;">Optimize Virtual
machines backup</span><br>
            </big></h3>
            <span style="font-weight: bold;"><br>
            <a name="reduce_virtual_machine_backup_size"></a>Virtual
machines</span>
often comes with non-preallocated disk image, that means the content of
disks
of the VM is saved on host physical machine to a disk image file which
smaller than the nominal VM disks size.<br>
Popular providers of platform virtualization solutions are Microsoft
(Azure, VirtualPC), Oracle (VirtualBox), and VMWare.<br>
Anyway, even this optimization is often far than optimal in terms of
space occupation on host machine, as the VM disk image contains also
the data not referenced in the disk's filesystem (as explained in Disk
images paragraph), which can be a sizeable overhead over the real size
of occupied disk space inside the virtual machine, that should be the
target size for disk image - which depending on the imaging software /
VM technology may also be compressed further reducing space
requirements.<br>
As for disk images created for backup and disaster recovery purpose it
is useful having PeaZip installed in the physical machine to zeroe the
free space before the disk image creation, the same apply to virtual
machines, where PeaZip should be available and routinely employed to
zeroe the free space on VM disks.<br>
This let the disk images it in an higly uniform and
highly compressible state, the unused data being physically removed
from the image (replaced with 0s), which results in saving smaller disk
image on the
host machine - which allows to improve backup procedure's speed, and to
more rationally use host disk space for
storing more virtual machine applicances, or to save more VM restore
points.<br>
            <br>
Read more about this topic: <a target="_blank"
 href="https://en.wikipedia.org/wiki/Virtual_machine">virtual machine
definition<img alt="optimize virtual disk" title="VM"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>
on Wikipedia, <a target="_blank"
 href="https://en.wikipedia.org/wiki/Windows_Virtual_PC">Microsoft
Virtual PC<img alt="microsoft virtual machine" title="VirtualPC"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>, <a
 target="_blank" href="https://www.virtualbox.org/">Oracle VM VirtualBox<img
 alt="oracle virtual machine technology" title="VirtualBox"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>, <a
 target="_blank" href="https://www.vmware.com/">VMWare<img
 alt="virtual disk player, server" title="VMWare"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a> mainstream
virtualization solution providers<br>
            </td>
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            <p> </p>
            <p><a href="peazip-help-faq.html">FAQ</a>
&gt; Tips &amp; tricks &gt; Reduce Virtual Machines disk image size</p>
Topics and search suggstions about how to optimize backup disk
occupation of virtual machines and virtual disk images, employ zero
delete files and free disk space functions to reduce size on disk of
QCOW2, VDI, VHD, VMDK files:
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 cellpadding="6" cellspacing="0">
              <tbody>
                <tr>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;">how to
optimize
backup size of virtual machines, <br>
                  <h4>reduce backup size of virtual machines and disk
images,</h4>
                  <h4>reduce
space occupation of disk images,</h4>
clean free disk space,<br>
reduce disk occupation of VM files,<br>
improve virtual disks compression,<br>
                  </td>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;">compress
vmdk files efficiently, <br>
how to improve compression of virtual disk images,<br>
reduce bakcup size zeroing free space on virtual disks,<br>
how to save disk space,<br>
                  <h4>optimize virtual disks size,</h4>
how to optimize backup of virtual machines and disk images<br>
                  </td>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;"> reduce
size of virtual machines,<br>
save disk space for backup of virtual machines,<br>
zero deletion of files,<br>
vmdk virtual disk,<br>
                  <h4>compress virtual machines,</h4>
reduce size of virtual disks,<br>
optimize QCOW2, VDI, VHD, VMDK image files </td>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;"> reduce
size on disk of virtual machines images,<br>
zero deletion of free disk space,<br>
overwrite free space,<br>
vhd format,<br>
how to compress virtual machines,<br>
how to optimize disk compression,<br>
                  <h4>reduce size on disk of virtual machines</h4>
                  </td>
                </tr>
              </tbody>
            </table>
            </td>
          </tr>
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